Improvement in globe-valves



N.c.LocKE.

GLOBE-VALVE. No. 169,817, Patented Nov. 9,1875.-

Fla 2 WITNESSES /mvbmroe NFEI'ERS, PHOTO-LITH'OGRAPHER, WASHINGTON. D.C.

UNITED STATES PATENT @Frroa.

AND ALPHEUS G. LOOKE,

OF SAME PL AGE.

IMPROVEMENT IN GLOBE-VALVES.

Specification forming part of Letters Patent No. 369,817, dated November9, 1875; application filed I April 5, 1875.

To all whom .it may concern:

Be it known that I, NATHANIEL G. LooKE, of Salem, in the county of Essexand State of Massachusetts, have invented new and useful Improvements inGlobe-Valves, of which the following is a specification:

The main object of this invention is to prevent cutting of the valve andof its seat by the steam, 850., passing through the valve when opened;and for this object the invention, among other features in detail,consists, principally, of a prolongation or extension of thevalve-stembeyond its seat portion, which prolongation is of suitableform and size to closelyfit within, and to continuously surround andclose, the opening through the valve-seat, and is of such a length that,when it is drawn entirely out of the valveopening to open said openingto the passage of steam, 850., its seat portion will be then situatedwithout and beyond the direct course or flow of the steam, 860., throughthe valve-opening, thereby securing such seat against injury by the flowof steam, 8tc., through the valve; and, again, in the combination, withthe above, of a seat for the seat portion of the valve-stem, which seatis located back and away from the valve-opening, so as to be outside ofand beyond the direct course or flow of the steam through thevah'e-opening, thereby securing it against injury by the flowof steam,850., through the valve.

In the accompanying plate of drawings, Figure 1 is a central sectionwith the valve closed;

. and Fig. 2, a similar view to Fig. 1, but of only apart of the valve,which is shown as open.

In the drawings, A represents the globular chamber of aglobe-valve; B,the inlet, and G the outlet, passages for the steam, 850., interceptedby a partition, D. The partition D has an opening, E, through it, forthe passage of steam, 850., from the inlet to the outlet openings ofchamber A. At the opening E the valve-stem seats, and this stem works,by its screw G, through the shell of the chamber A, all as ordinarily.The seat a for the valvestem F is around, and outside of, and back awayfrom, the valve-opening E, as shown in the drawings; and on this seat athe valvestem F seats by its disk b, of truncated form, as shown. H, anextension or prolongation of the valve-stem F. This extension H is fromthe disk b of valve-stem, and it is made of a form and of a shape tonicely and closely fit 7 within and to continuously surround and closethe periphery of the valve-opening, so that before steam, 8tc., can passthrough the valveopening the full length of the prolongation must bedrawn out of, and its end f made to clear, the valveopening E; and,obviously, it this extension or prolongation H be either long or short,the seat portion b of the valvestem F will be carried correspondingly agreater or lesser distance away from the valveopening before steam,8tc., can pass through the valve-opening, thereby proportionatelyremovingit from the direct line of flow or course of the steam, 850.,through the valve-opening, and securing protection to it against beinginjured and cut by the steam, 850., which passes through thevalve-opening.

The location above described of the seat a about valve opening E for thevalve-stem seat b also secures its protection against being injured andcut by the steam, 8m, flowing through the valve-opening.

The end fof valve-projection H is beveled, as shown, and thisbevelingserves to direct the How of steam through the valve-opening whenthe valve is opened, as described, and thus to increase the protectionof the valve stem seat 1) against being injured and cut by steam, asdescribed.

g, a groove or recess between valve-seat c and valve-opening E. Thisrecess 9 catches the sediment in the steam, 8m, and retains and holds itfrom contact with the two seat portions a and b of the valve.

What I claim as my invention is- 1. The prolongation or extension H tovalvestem seat I), constructed and formed to closely fit within and tocontinuously surround the valve-opening E, substantially as described,

for the purpose specified.

2. The combination, with the prolongation or extension H of valve-stemseat 1), constructed to closely fit within and to continuously surroundthe valve-opening E. of the to the valve-opening seat a, locatedrelatively recess g open and clear when the seat I) of the valve-stem isclosed against the seat a, substantially as described, for the purposespeci- E, all substantially as and for the purpose described.

3. The end f of the prolongation H to valvestem seat I), beveled as andfor thepurpose fied. specified. NATHANIEL O. LOCKE.

4. The combination of the seat a of the valve- Witnesses: I case,constructed with a recess, g, Withthe EBEN N. WALTON, seat I) of thevalve-stem, all so as to leave the ALPHEUS O. LOOKE.

